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42 U.S.C. 7401 et seq.
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Nomenclature changes to part 52 appear at 81 FR 74586, Oct. 26, 2016.
(a) This section applies to any variance, exception, exemption, alternative emission limitation, bubble, alternative sampling or testing method, compliance schedule revision, alternative compliance schedule, or any other substantial change to a provision of the state implementation plan, granted by the Department of Ecology, the Department of Natural Resources, the Energy Facility Site Evaluation Council, or a local air pollution control agency in accordance with any discretionary authority granted under its statutes or regulations, regardless of whether such statutes or regulations are part of the state implementation plan.
(b) Any change to a provision of the state implementation plan described in paragraph (a) of this section must be submitted by the state for approval by EPA in accordance with the requirements of 40 CFR 51.104.
(c) Any change to a provision of the state implementation plan described in paragraph (a) of this section does not modify the requirements of the federally-approved state implementation plan or a federally-promulgated implementation plan until approved by EPA as a revision to the state implementation plan in accordance with section 110 of the Clean Air Act.
[56 FR 24136, May 29, 1991]